arch/frv/kernel/sys_frv.c

   1 /* sys_frv.c: FRV arch-specific syscall wrappers
   2  *
   3  * Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  * - Derived from arch/m68k/kernel/sys_m68k.c
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the License, or (at your option) any later version.
  11  */
  12
  13 #include <linux/errno.h>
  14 #include <linux/sched.h>
  15 #include <linux/mm.h>
  16 #include <linux/fs.h>
  17 #include <linux/smp.h>
  18 #include <linux/sem.h>
  19 #include <linux/msg.h>
  20 #include <linux/shm.h>
  21 #include <linux/stat.h>
  22 #include <linux/mman.h>
  23 #include <linux/file.h>
  24 #include <linux/syscalls.h>
  25 #include <linux/ipc.h>
  26
  27 #include <asm/setup.h>
  28 #include <asm/uaccess.h>
  29
  30 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  31                           unsigned long prot, unsigned long flags,
  32                           unsigned long fd, unsigned long pgoff)
  33 {
  34         /* As with sparc32, make sure the shift for mmap2 is constant
  35            (12), no matter what PAGE_SIZE we have.... */
  36
  37         /* But unlike sparc32, don't just silently break if we're
  38            trying to map something we can't */
  39         if (pgoff & ((1 << (PAGE_SHIFT - 12)) - 1))
  40                 return -EINVAL;
  41
  42         return sys_mmap_pgoff(addr, len, prot, flags, fd,
  43                               pgoff >> (PAGE_SHIFT - 12));
  44 }
  45
  46 /*
  47  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  48  *
  49  * This is really horribly ugly.
  50  */
  51 asmlinkage long sys_ipc(unsigned long call,
  52                         unsigned long first,
  53                         unsigned long second,
  54                         unsigned long third,
  55                         void __user *ptr,
  56                         unsigned long fifth)
  57 {
  58         int version, ret;
  59
  60         version = call >> 16; /* hack for backward compatibility */
  61         call &= 0xffff;
  62
  63         switch (call) {
  64         case SEMOP:
  65                 return sys_semtimedop(first, (struct sembuf __user *)ptr, second, NULL);
  66         case SEMTIMEDOP:
  67                 return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
  68                                       (const struct timespec __user *)fifth);
  69
  70         case SEMGET:
  71                 return sys_semget (first, second, third);
  72         case SEMCTL: {
  73                 union semun fourth;
  74                 if (!ptr)
  75                         return -EINVAL;
  76                 if (get_user(fourth.__pad, (void * __user *) ptr))
  77                         return -EFAULT;
  78                 return sys_semctl (first, second, third, fourth);
  79         }
  80
  81         case MSGSND:
  82                 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
  83                                    second, third);
  84         case MSGRCV:
  85                 switch (version) {
  86                 case 0: {
  87                         struct ipc_kludge tmp;
  88                         if (!ptr)
  89                                 return -EINVAL;
  90
  91                         if (copy_from_user(&tmp,
  92                                            (struct ipc_kludge __user *) ptr,
  93                                            sizeof (tmp)))
  94                                 return -EFAULT;
  95                         return sys_msgrcv (first, tmp.msgp, second,
  96                                            tmp.msgtyp, third);
  97                 }
  98                 default:
  99                         return sys_msgrcv (first,
 100                                            (struct msgbuf __user *) ptr,
 101                                            second, fifth, third);
 102                 }
 103         case MSGGET:
 104                 return sys_msgget ((key_t) first, second);
 105         case MSGCTL:
 106                 return sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
 107
 108         case SHMAT:
 109                 switch (version) {
 110                 default: {
 111                         ulong raddr;
 112                         ret = do_shmat (first, (char __user *) ptr, second, &raddr);
 113                         if (ret)
 114                                 return ret;
 115                         return put_user (raddr, (ulong __user *) third);
 116                 }
 117                 case 1: /* iBCS2 emulator entry point */
 118                         if (!segment_eq(get_fs(), get_ds()))
 119                                 return -EINVAL;
 120                         /* The "(ulong *) third" is valid _only_ because of the kernel segment thing */
 121                         return do_shmat (first, (char __user *) ptr, second, (ulong *) third);
 122                 }
 123         case SHMDT:
 124                 return sys_shmdt ((char __user *)ptr);
 125         case SHMGET:
 126                 return sys_shmget (first, second, third);
 127         case SHMCTL:
 128                 return sys_shmctl (first, second,
 129                                    (struct shmid_ds __user *) ptr);
 130         default:
 131                 return -ENOSYS;
 132         }
 133 }